Physical Examinations

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Commercial Driver’s License Exam

P.P.D. (Purified Protein Derivative) Skin Test

A method used to diagnose tuberculosis (TB). PPD Screens typically begin by cleansing the forearm with rubbing alcohol. The PPD extract is then injected under the top layer of the skin, causing a welt to form on the skin. This welt usually goes away in a few hours. The reaction can take up to 48-72 hours to develop. The treated area is then examined to determine if the participant has had a significant reaction. This reaction is measured in millimeters of firm swelling (induration) at the sight of the injection.